{"id":{"repo_id":"washington","oai_identifier":"oai:digital.lib.washington.edu:1773/49427"},"canonical_url":"https://search.dev.ndltd.org/etd/washington/oai:digital.lib.washington.edu:1773/49427","repository":{"repo_id":"washington","name":"University of Washington","base_url":"https://digital.lib.washington.edu/server/oai/request"},"display":{"title":"Recent Progress in Quantum Gravity: Karch-Randall Braneworld, Entanglement Islands and Graviton Mass","abstract":"In this thesis, we review important recent progress in our understanding of entanglement islands and quantum gravity. We illustrate the concept of entanglement island and its implications to the black hole information paradox using the so called KR braneworld, which provides the only existing calculable models of entanglement island in higher spacetime dimensions ($D \\geq 2 + 1$). Then we point out that the physics of the Karch-Randall braneworld motivates us to formulate a conjecture that, at the fine grained level, a large class of entanglement islands can exist only in massive gravity theories. We provide evidence supporting our conjecture by showing the absence of entanglement islands in a deformed KR braneworld model where the graviton is massless. At the end, we provide a general proof of our conjecture for a broad class of spacetimes (with dimension $D \\geq 2 + 1$), which include asymptotically Anti-de Sitter spacetimes, using Gauss’ law.","abstract_html":"In this thesis, we review important recent progress in our understanding of entanglement islands and quantum gravity. We illustrate the concept of entanglement island and its implications to the black hole information paradox using the so called KR braneworld, which provides the only existing calculable models of entanglement island in higher spacetime dimensions ($D \\geq 2 + 1$). Then we point out that the physics of the Karch-Randall braneworld motivates us to formulate a conjecture that, at the fine grained level, a large class of entanglement islands can exist only in massive gravity theories. We provide evidence supporting our conjecture by showing the absence of entanglement islands in a deformed KR braneworld model where the graviton is massless. At the end, we provide a general proof of our conjecture for a broad class of spacetimes (with dimension $D \\geq 2 + 1$), which include asymptotically Anti-de Sitter spacetimes, using Gauss’ law.","abstract_has_math":true,"creators":["Geng, Hao"],"institution":null,"degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":[],"advisors":["den Nijs, Marcel"],"committee_chairs":[],"committee_members":[],"year":2022,"date_issued":"2022-09-23","date_published":"2022-09-23","updated_at":"2026-07-24T05:58:27Z","subjects":["Black Hole Information Paradox","Conformal Field Theory","Gauge/Gravity Duality","Quantum Gravity","String Theory","Theoretical physics"],"languages":["en_US"],"rights":["CC BY-NC-ND"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/1773/49427","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["den Nijs, Marcel"]},{"key":"dc:creator","label":"Author","values":["Geng, Hao"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2022-09-23T20:48:21Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2022-09-23T20:48:21Z"]},{"key":"dc:date.issued","label":"Date","values":["2022-09-23"]},{"key":"dc:type","label":"Dc Type","values":["Thesis"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Black Hole Information Paradox","Conformal Field Theory","Gauge/Gravity Duality","Quantum Gravity","String Theory","Theoretical physics"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language.iso","label":"Language (ISO)","values":["en_US"]},{"key":"dc:rights","label":"Dc Rights","values":["CC BY-NC-ND"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.other","label":"Dc Identifier Other","values":["Geng_washington_0250E_24669.pdf"]},{"key":"dc:identifier.uri","label":"Identifier URI","values":["http://hdl.handle.net/1773/49427"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Thesis (Ph.D.)--University of Washington, 2022"]},{"key":"dc:description.abstract","label":"Abstract","values":["In this thesis, we review important recent progress in our understanding of entanglement islands and quantum gravity. We illustrate the concept of entanglement island and its implications to the black hole information paradox using the so called KR braneworld, which provides the only existing calculable models of entanglement island in higher spacetime dimensions ($D \\geq 2 + 1$). Then we point out that the physics of the Karch-Randall braneworld motivates us to formulate a conjecture that, at the fine grained level, a large class of entanglement islands can exist only in massive gravity theories. We provide evidence supporting our conjecture by showing the absence of entanglement islands in a deformed KR braneworld model where the graviton is massless. At the end, we provide a general proof of our conjecture for a broad class of spacetimes (with dimension $D \\geq 2 + 1$), which include asymptotically Anti-de Sitter spacetimes, using Gauss’ law."]},{"key":"dc:format.mimetype","label":"Dc Format Mimetype","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Recent Progress in Quantum Gravity: Karch-Randall Braneworld, Entanglement Islands and Graviton Mass"]}]}],"canonical_facts":{"dc:contributor.advisor":["den Nijs, Marcel"],"dc:creator":["Geng, Hao"],"dc:date.accessioned":["2022-09-23T20:48:21Z"],"dc:date.available":["2022-09-23T20:48:21Z"],"dc:date.issued":["2022-09-23"],"dc:description":["Thesis (Ph.D.)--University of Washington, 2022"],"dc:description.abstract":["In this thesis, we review important recent progress in our understanding of entanglement islands and quantum gravity. We illustrate the concept of entanglement island and its implications to the black hole information paradox using the so called KR braneworld, which provides the only existing calculable models of entanglement island in higher spacetime dimensions ($D \\geq 2 + 1$). Then we point out that the physics of the Karch-Randall braneworld motivates us to formulate a conjecture that, at the fine grained level, a large class of entanglement islands can exist only in massive gravity theories. We provide evidence supporting our conjecture by showing the absence of entanglement islands in a deformed KR braneworld model where the graviton is massless. At the end, we provide a general proof of our conjecture for a broad class of spacetimes (with dimension $D \\geq 2 + 1$), which include asymptotically Anti-de Sitter spacetimes, using Gauss’ law."],"dc:format.mimetype":["application/pdf"],"dc:identifier.other":["Geng_washington_0250E_24669.pdf"],"dc:identifier.uri":["http://hdl.handle.net/1773/49427"],"dc:language.iso":["en_US"],"dc:rights":["CC BY-NC-ND"],"dc:subject":["Black Hole Information Paradox","Conformal Field Theory","Gauge/Gravity Duality","Quantum Gravity","String Theory","Theoretical physics"],"dc:title":["Recent Progress in Quantum Gravity: Karch-Randall Braneworld, Entanglement Islands and Graviton Mass"],"dc:type":["Thesis"]},"updated_at":"2026-07-24T05:58:27Z"}